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Old 20-05-2009: 20th May 2009 16:05 #1 
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Default A pretty simple differentiation question (+rep)!!
 
Ok, am seriously suffering from brain-numbing revision boredom. Can't remember how to differentiate this:

p = 654 / (456q^2)

Any help would be great! Thanks
 
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Old 20-05-2009: 20th May 2009 16:06 #2 
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Default Re: A pretty simple differentiation question (+rep)!!
 
Clue:

p = 654/456 x q^-2
 
Old 20-05-2009: 20th May 2009 16:08 #3 
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Default Re: A pretty simple differentiation question (+rep)!!
 
bring that bottom up to the top which makes it q^-2 then take it from there, times the 654 by -2 then lower the power to -3.
Old 20-05-2009: 20th May 2009 16:09 #4 
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Default Re: A pretty simple differentiation question (+rep)!!
 
-1308/456 * q^-3
Old 20-05-2009: 20th May 2009 16:10 #5 
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Default Re: A pretty simple differentiation question (+rep)!!
 
Ok, you have to understand I'm having serious brain numb here.

When I bring the bottom up top, do I multiply 654 and 456 so it ends up as 298224q^-2 and then just differentiate that (which I'm capable of lol)?
 
Old 20-05-2009: 20th May 2009 16:10 #6 
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Default Re: A pretty simple differentiation question (+rep)!!
 
p = 654 / (456q^2)

p = 654/456 * 1/q^2
p = 109/76 * q^-2

Bring the power down, then decrease the power by one.

p = -109/38 * q^-3

Therefore

Final Ans: -109/(38 *q^3)
 
Old 20-05-2009: 20th May 2009 16:12 #7 
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Default Re: A pretty simple differentiation question (+rep)!!
 
Originally Posted by DitaVonTeese
Ok, you have to understand I'm having serious brain numb here.

When I bring the bottom up top, do I multiply 654 and 456 so it ends up as 298224q^-2 and then just differentiate that (which I'm capable of lol)?

No u dont, look at my explantion above. Take it as to fractions being multiplied together.
 
Old 20-05-2009: 20th May 2009 16:13 #8 
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Default Re: A pretty simple differentiation question (+rep)!!
 
p= 654/ 456q^2

p= (654q^-2/456)

p= -2(645)q^-3/456

There, hope that helped!
Old 20-05-2009: 20th May 2009 16:13 #9 
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Default Re: A pretty simple differentiation question (+rep)!!
 
OK, got it!! Thanks very much for al your help! I knew I could rely on TSR to give me the answer
 
 
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